.secondSection {
   position: relative;
   padding-top: 56px;
  // tab
  ul {
    top: 0;
    width: 100%;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    position: absolute;
    background-color: #e36c3f;
    font-family: SimHei;
    font-weight: bold;

    &.isFixed {
      position: fixed;
    }

    li {
      position: relative;
      color: white;
      list-style: none;

      .line {
        position: absolute;
        bottom: -8px;
        left: 50%;
        transform: translateX(-50%);
        height: 4px;
        background-color: yellow;
        width: 100%;
        opacity: 0;
        transition: opacity .3s;

        &.visible {
          opacity: 1;
        }
      }
    }
  }

  // tab content
  section {
    scroll-margin: 40px;
    padding: 16px;
    h2 {
      color: white;
    }
    img {
      margin-top: 16px;
      width: 100%;
      border-radius: 6px;
    }
  }
  
  // App内打开
  .btnWrapper{
    position: fixed;
    height: 64px;
    padding: 0 16px;
    bottom: 0;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(0deg, rgba(255,255,255,1) 0%, rgba(255,255,255,0) 100%);
    opacity: 0;
    transition: opacity .3s,transform .3s;
    // z-index: -1;
    transform: translateY(64px);
 
    &.visible{
      opacity: 1;
      transform: translateY(0);

    }

    img{
      width: 100px;
    }
    button{
      border: none;
      padding: 8px 16px;
      color: white;
      border-radius: 50px;
      background: #fb7299;
    }
  }
}